This material originates in a 3PP Source

Orcus

Areas of Concern: Undeath
Domains: Chaos, Death, Destruction, Evil
Favored Weapon: Rod (light mace)

Obedience

To regain his spells, a thaumaturge serving Orcus grinds a half-pound of bones from the skeleton of a sentient creature and mixes the granular remnants with water to create a gray paste, which he then ingests.